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74.80 microns is about 0.0000005 times as tall as St. Paul's Cathedral.
In other words, it's 0.000000430 times the height of St. Paul's Cathedral, and the height of St. Paul's Cathedral is 2,330,000 times that amount.
(London, England, United Kingdom)
St. Paul's Cathedral measures 174,000,000 microns to its peak. The southwest tower of the Cathedral contains the bell known as "Great Paul," which is the largest bell in Great Britain at 15,000 kg (16.5 tons), outweighing the more iconic Big Ben bell by about 3,000 kg (3 tons).
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